it makes the water we use in our homes every day safer. but prescription drugs aren't just found in the medicine cabinet. public water supplies can contain trace amounts of everything from birth control to antidepressants if they're disposed of improblemerly. >> the concern is, we don't know what these chemicals do in the body over a lifetime of exposure. >> that's why the epa is working with states and companies like united water in new jersey to learn more about the health effects. now researchers want the pharmaceutical industry on board. in fact, at least one drug company still advises their customers on those bottle labels to flush leftover medication down the boy let, where water experts say it eventually winds up back in our drinking water. >> and t.j. is with us now. fascinating, this information about the drinking water. i had no idea. so, here's the question. what do i do if i've got extra bottles in my cabinet? what do i do with them? >> reporter: all right, well, the epa says we should first seek out a local pharmacy or governm